Signed-off-by: Liran Alon <liran.alon@xxxxxxxxxx>
Signed-off-by: Jim Mattson <jmattson@xxxxxxxxxx>
---
arch/x86/kvm/vmx.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 9a0cf93ce8a7..72bd4b6a90fc 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2167,6 +2167,19 @@ static __always_inline void vmcs_writel(unsigned long field, unsigned long value
__vmcs_writel(field, value);
}
+static bool cpu_has_vmcs_field(unsigned long field)
+{
+ unsigned long value;
+ u8 error;
+
+ asm volatile (__ex_clear(ASM_VMX_VMREAD_RDX_RAX, "%0") "; seta %1"
+ : "=a"(value), "=qm"(error)
+ : "d"(field)
+ : "cc");
+
+ return error;
+}
+
static __always_inline void vmcs_clear_bits(unsigned long field, u32 mask)
{
BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x2000,
--
1.9.1
